simple Jquery in progress image

//start function
function  update_consignement_in_details() {

  $('#msg_div').html('<img width="20" height="20" src="'+CI.base_url+'images/b_loading.gif">');
  $('#msg_div').show();

  //function content


  $('#msg_div').css("color", "green"); 

  $('#msg_div').html('Cosignment-In updated successfully');
}